Title PROCESS FOR THE P REPARATION OF GRAPHENE

and CiB 31/04 (2006 01)

Patent

Atlas literature

Patent

US 9,139,439

Title PROCESS FOR THE P REPARATION OF GRAPHENE

Pagona Papakonstantinou, Naigui Shang

7 September 2012·US

Claims

Claims define the patent's legal scope. Independent claims stand alone; dependent claims (nested) narrow them. Click a claim to expand its dependents.

3 independent · 14 dependent

1
Independentgraphenegraphiteionic liquid
A process for the preparation of graphene or graphene-like fragments of another layered structure, said process comprising the step of mixing and grinding graphite or said other layered structure with at least one ionic liquid, wherein the process does not comprise a sonication step.
1. 3
  Dependent← claim 1
  A process as claimed in claim claim 1, wherein mixing and grinding occurs for a time period of between 0.5 and 4 hours.
2. 4
  Dependent← claim 1natural graphite
  A process as claimed in claim 1, wherein the graphite is natural graphite.
3. 5
  Dependent← claim 1graphene nanosheetsgraphene nanodots
  A process as claimed in claim 1, wherein the graphene is in the form of graphene nanosheets or graphene nanodots.
4. 9
  Dependent← claim 1ionic liquid with ammonium, imidazolium or pyridinium cations
  A process as claimed in claim 1, wherein the ionic liquid comprises an organic salt containing one more cations selected from the group consisting of ammonium, imidazolium and pyridinium ions.
5. 12
  Dependent← claim 1
  A process as claimed in claim 1, wherein the %.
6. 13
  Dependent← claim 1
  A process as claimed in claim 1, wherein the agent or an oxidising agent.
7. 14
  Dependent← claim 1
  A process as claimed in claim 1 further comprising graphene.
8. 16
  Dependent← claim 1
  A process of claim 1 having a yield of at least nanodots of greater than 10 % relative to the material.
2
Independent
canceled
17
Independent
17-24. canceled oxygen content of the graphene is less than 5 at process does not include the use of a reducing separating the ionic liquid from the comprising separating the ionic liquid from the by centrifugation. one of graphene nanosheets andgraphene starting weight of the graphite or other layered

Materials

Materials described outside the worked examples.

graphene

Product

graphite

Starting Material

Process steps

Additional fabrication and treatment steps described in the patent.

Mechanical Exfoliation Grinding

Step 1

Duration

30, 240 min

Process details

method:mixing and grinding

ionic liquid:at least one ionic liquid

no sonication:true

Reported properties

Performance values and ranges asserted in the specification or claims.

Property	Value	Material
graphene nanosheet layer count	2–4 layers	graphene nanosheets
graphene nanodot height	1–3 nm

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